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Diffstat (limited to 'ext/DynaLoader/dl_aix.xs')
| -rw-r--r-- | ext/DynaLoader/dl_aix.xs | 582 |
1 files changed, 582 insertions, 0 deletions
diff --git a/ext/DynaLoader/dl_aix.xs b/ext/DynaLoader/dl_aix.xs new file mode 100644 index 0000000000..f8bace1314 --- /dev/null +++ b/ext/DynaLoader/dl_aix.xs @@ -0,0 +1,582 @@ +/* dl_aix.xs + * + * Written: 8/31/94 by Wayne Scott (wscott@ichips.intel.com) + * + * All I did was take Jens-Uwe Mager's libdl emulation library for + * AIX and merged it with the dl_dlopen.xs file to create a dynamic library + * package that works for AIX. + * + * I did change all malloc's, free's, strdup's, calloc's to use the perl + * equilvant. I also removed some stuff we will not need. Call fini() + * on statup... It can probably be trimmed more. + */ + +/* + * @(#)dlfcn.c 1.5 revision of 93/02/14 20:14:17 + * This is an unpublished work copyright (c) 1992 Helios Software GmbH + * 3000 Hannover 1, Germany + */ +#include "EXTERN.h" +#include "perl.h" +#include "XSUB.h" + +#include <stdio.h> +#include <errno.h> +#include <string.h> +#include <stdlib.h> +#include <sys/types.h> +#include <sys/ldr.h> +#include <a.out.h> +#include <ldfcn.h> + +/* + * We simulate dlopen() et al. through a call to load. Because AIX has + * no call to find an exported symbol we read the loader section of the + * loaded module and build a list of exported symbols and their virtual + * address. + */ + +typedef struct { + char *name; /* the symbols's name */ + void *addr; /* its relocated virtual address */ +} Export, *ExportPtr; + +/* + * The void * handle returned from dlopen is actually a ModulePtr. + */ +typedef struct Module { + struct Module *next; + char *name; /* module name for refcounting */ + int refCnt; /* the number of references */ + void *entry; /* entry point from load */ + int nExports; /* the number of exports found */ + ExportPtr exports; /* the array of exports */ +} Module, *ModulePtr; + +/* + * We keep a list of all loaded modules to be able to call the fini + * handlers at atexit() time. + */ +static ModulePtr modList; + +/* + * The last error from one of the dl* routines is kept in static + * variables here. Each error is returned only once to the caller. + */ +static char errbuf[BUFSIZ]; +static int errvalid; + +static void caterr(char *); +static int readExports(ModulePtr); +static void terminate(void); +static void *findMain(void); + + +/* ARGSUSED */ +void *dlopen(char *path, int mode) +{ + register ModulePtr mp; + static void *mainModule; + + /* + * Upon the first call register a terminate handler that will + * close all libraries. Also get a reference to the main module + * for use with loadbind. + */ + if (!mainModule) { + if ((mainModule = findMain()) == NULL) + return NULL; + atexit(terminate); + } + /* + * Scan the list of modules if have the module already loaded. + */ + for (mp = modList; mp; mp = mp->next) + if (strcmp(mp->name, path) == 0) { + mp->refCnt++; + return mp; + } + Newz(1000,mp,1,Module); + if (mp == NULL) { + errvalid++; + strcpy(errbuf, "Newz: "); + strcat(errbuf, strerror(errno)); + return NULL; + } + + if ((mp->name = savepv(path)) == NULL) { + errvalid++; + strcpy(errbuf, "savepv: "); + strcat(errbuf, strerror(errno)); + safefree(mp); + return NULL; + } + /* + * load should be declared load(const char *...). Thus we + * cast the path to a normal char *. Ugly. + */ + if ((mp->entry = (void *)load((char *)path, L_NOAUTODEFER, NULL)) == NULL) { + safefree(mp->name); + safefree(mp); + errvalid++; + strcpy(errbuf, "dlopen: "); + strcat(errbuf, path); + strcat(errbuf, ": "); + /* + * If AIX says the file is not executable, the error + * can be further described by querying the loader about + * the last error. + */ + if (errno == ENOEXEC) { + char *tmp[BUFSIZ/sizeof(char *)]; + if (loadquery(L_GETMESSAGES, tmp, sizeof(tmp)) == -1) + strcpy(errbuf, strerror(errno)); + else { + char **p; + for (p = tmp; *p; p++) + caterr(*p); + } + } else + strcat(errbuf, strerror(errno)); + return NULL; + } + mp->refCnt = 1; + mp->next = modList; + modList = mp; + if (loadbind(0, mainModule, mp->entry) == -1) { + dlclose(mp); + errvalid++; + strcpy(errbuf, "loadbind: "); + strcat(errbuf, strerror(errno)); + return NULL; + } + if (readExports(mp) == -1) { + dlclose(mp); + return NULL; + } + return mp; +} + +/* + * Attempt to decipher an AIX loader error message and append it + * to our static error message buffer. + */ +static void caterr(char *s) +{ + register char *p = s; + + while (*p >= '0' && *p <= '9') + p++; + switch(atoi(s)) { + case L_ERROR_TOOMANY: + strcat(errbuf, "to many errors"); + break; + case L_ERROR_NOLIB: + strcat(errbuf, "can't load library"); + strcat(errbuf, p); + break; + case L_ERROR_UNDEF: + strcat(errbuf, "can't find symbol"); + strcat(errbuf, p); + break; + case L_ERROR_RLDBAD: + strcat(errbuf, "bad RLD"); + strcat(errbuf, p); + break; + case L_ERROR_FORMAT: + strcat(errbuf, "bad exec format in"); + strcat(errbuf, p); + break; + case L_ERROR_ERRNO: + strcat(errbuf, strerror(atoi(++p))); + break; + default: + strcat(errbuf, s); + break; + } +} + +void *dlsym(void *handle, const char *symbol) +{ + register ModulePtr mp = (ModulePtr)handle; + register ExportPtr ep; + register int i; + + /* + * Could speed up search, but I assume that one assigns + * the result to function pointers anyways. + */ + for (ep = mp->exports, i = mp->nExports; i; i--, ep++) + if (strcmp(ep->name, symbol) == 0) + return ep->addr; + errvalid++; + strcpy(errbuf, "dlsym: undefined symbol "); + strcat(errbuf, symbol); + return NULL; +} + +char *dlerror(void) +{ + if (errvalid) { + errvalid = 0; + return errbuf; + } + return NULL; +} + +int dlclose(void *handle) +{ + register ModulePtr mp = (ModulePtr)handle; + int result; + register ModulePtr mp1; + + if (--mp->refCnt > 0) + return 0; + result = unload(mp->entry); + if (result == -1) { + errvalid++; + strcpy(errbuf, strerror(errno)); + } + if (mp->exports) { + register ExportPtr ep; + register int i; + for (ep = mp->exports, i = mp->nExports; i; i--, ep++) + if (ep->name) + safefree(ep->name); + safefree(mp->exports); + } + if (mp == modList) + modList = mp->next; + else { + for (mp1 = modList; mp1; mp1 = mp1->next) + if (mp1->next == mp) { + mp1->next = mp->next; + break; + } + } + safefree(mp->name); + safefree(mp); + return result; +} + +static void terminate(void) +{ + while (modList) + dlclose(modList); +} + +/* Added by Wayne Scott + * This is needed because the ldopen system call calls + * calloc to allocated a block of date. The ldclose call calls free. + * Without this we get this system calloc and perl's free, resulting + * in a "Bad free" message. This way we always use perl's malloc. + */ +void *calloc(size_t ne, size_t sz) +{ + void *out; + + out = (void *) safemalloc(ne*sz); + memzero(out, ne*sz); + return(out); +} + +/* + * Build the export table from the XCOFF .loader section. + */ +static int readExports(ModulePtr mp) +{ + LDFILE *ldp = NULL; + SCNHDR sh; + LDHDR *lhp; + char *ldbuf; + LDSYM *ls; + int i; + ExportPtr ep; + + if ((ldp = ldopen(mp->name, ldp)) == NULL) { + struct ld_info *lp; + char *buf; + int size = 4*1024; + if (errno != ENOENT) { + errvalid++; + strcpy(errbuf, "readExports: "); + strcat(errbuf, strerror(errno)); + return -1; + } + /* + * The module might be loaded due to the LIBPATH + * environment variable. Search for the loaded + * module using L_GETINFO. + */ + if ((buf = safemalloc(size)) == NULL) { + errvalid++; + strcpy(errbuf, "readExports: "); + strcat(errbuf, strerror(errno)); + return -1; + } + while ((i = loadquery(L_GETINFO, buf, size)) == -1 && errno == ENOMEM) { + safefree(buf); + size += 4*1024; + if ((buf = safemalloc(size)) == NULL) { + errvalid++; + strcpy(errbuf, "readExports: "); + strcat(errbuf, strerror(errno)); + return -1; + } + } + if (i == -1) { + errvalid++; + strcpy(errbuf, "readExports: "); + strcat(errbuf, strerror(errno)); + safefree(buf); + return -1; + } + /* + * Traverse the list of loaded modules. The entry point + * returned by load() does actually point to the data + * segment origin. + */ + lp = (struct ld_info *)buf; + while (lp) { + if (lp->ldinfo_dataorg == mp->entry) { + ldp = ldopen(lp->ldinfo_filename, ldp); + break; + } + if (lp->ldinfo_next == 0) + lp = NULL; + else + lp = (struct ld_info *)((char *)lp + lp->ldinfo_next); + } + safefree(buf); + if (!ldp) { + errvalid++; + strcpy(errbuf, "readExports: "); + strcat(errbuf, strerror(errno)); + return -1; + } + } + if (TYPE(ldp) != U802TOCMAGIC) { + errvalid++; + strcpy(errbuf, "readExports: bad magic"); + while(ldclose(ldp) == FAILURE) + ; + return -1; + } + if (ldnshread(ldp, _LOADER, &sh) != SUCCESS) { + errvalid++; + strcpy(errbuf, "readExports: cannot read loader section header"); + while(ldclose(ldp) == FAILURE) + ; + return -1; + } + /* + * We read the complete loader section in one chunk, this makes + * finding long symbol names residing in the string table easier. + */ + if ((ldbuf = (char *)safemalloc(sh.s_size)) == NULL) { + errvalid++; + strcpy(errbuf, "readExports: "); + strcat(errbuf, strerror(errno)); + while(ldclose(ldp) == FAILURE) + ; + return -1; + } + if (FSEEK(ldp, sh.s_scnptr, BEGINNING) != OKFSEEK) { + errvalid++; + strcpy(errbuf, "readExports: cannot seek to loader section"); + safefree(ldbuf); + while(ldclose(ldp) == FAILURE) + ; + return -1; + } + if (FREAD(ldbuf, sh.s_size, 1, ldp) != 1) { + errvalid++; + strcpy(errbuf, "readExports: cannot read loader section"); + safefree(ldbuf); + while(ldclose(ldp) == FAILURE) + ; + return -1; + } + lhp = (LDHDR *)ldbuf; + ls = (LDSYM *)(ldbuf+LDHDRSZ); + /* + * Count the number of exports to include in our export table. + */ + for (i = lhp->l_nsyms; i; i--, ls++) { + if (!LDR_EXPORT(*ls)) + continue; + mp->nExports++; + } + Newz(1001, mp->exports, mp->nExports, Export); + if (mp->exports == NULL) { + errvalid++; + strcpy(errbuf, "readExports: "); + strcat(errbuf, strerror(errno)); + safefree(ldbuf); + while(ldclose(ldp) == FAILURE) + ; + return -1; + } + /* + * Fill in the export table. All entries are relative to + * the entry point we got from load. + */ + ep = mp->exports; + ls = (LDSYM *)(ldbuf+LDHDRSZ); + for (i = lhp->l_nsyms; i; i--, ls++) { + char *symname; + if (!LDR_EXPORT(*ls)) + continue; + if (ls->l_zeroes == 0) + symname = ls->l_offset+lhp->l_stoff+ldbuf; + else + symname = ls->l_name; + ep->name = savepv(symname); + ep->addr = (void *)((unsigned long)mp->entry + ls->l_value); + ep++; + } + safefree(ldbuf); + while(ldclose(ldp) == FAILURE) + ; + return 0; +} + +/* + * Find the main modules entry point. This is used as export pointer + * for loadbind() to be able to resolve references to the main part. + */ +static void * findMain(void) +{ + struct ld_info *lp; + char *buf; + int size = 4*1024; + int i; + void *ret; + + if ((buf = safemalloc(size)) == NULL) { + errvalid++; + strcpy(errbuf, "findMain: "); + strcat(errbuf, strerror(errno)); + return NULL; + } + while ((i = loadquery(L_GETINFO, buf, size)) == -1 && errno == ENOMEM) { + safefree(buf); + size += 4*1024; + if ((buf = safemalloc(size)) == NULL) { + errvalid++; + strcpy(errbuf, "findMain: "); + strcat(errbuf, strerror(errno)); + return NULL; + } + } + if (i == -1) { + errvalid++; + strcpy(errbuf, "findMain: "); + strcat(errbuf, strerror(errno)); + safefree(buf); + return NULL; + } + /* + * The first entry is the main module. The entry point + * returned by load() does actually point to the data + * segment origin. + */ + lp = (struct ld_info *)buf; + ret = lp->ldinfo_dataorg; + safefree(buf); + return ret; +} + +/* dl_dlopen.xs + * + * Platform: SunOS/Solaris, possibly others which use dlopen. + * Author: Paul Marquess (pmarquess@bfsec.bt.co.uk) + * Created: 10th July 1994 + * + * Modified: + * 15th July 1994 - Added code to explicitly save any error messages. + * 3rd August 1994 - Upgraded to v3 spec. + * 9th August 1994 - Changed to use IV + * 10th August 1994 - Tim Bunce: Added RTLD_LAZY, switchable debugging, + * basic FreeBSD support, removed ClearError + * + */ + +/* Porting notes: + + see dl_dlopen.xs + +*/ + +#include "dlutils.c" /* SaveError() etc */ + + +static void +dl_private_init() +{ + (void)dl_generic_private_init(); +} + +MODULE = DynaLoader PACKAGE = DynaLoader + +BOOT: + (void)dl_private_init(); + + +void * +dl_load_file(filename) + char * filename + CODE: + DLDEBUG(1,fprintf(stderr,"dl_load_file(%s):\n", filename)); + RETVAL = dlopen(filename, 1) ; + DLDEBUG(2,fprintf(stderr," libref=%x\n", RETVAL)); + ST(0) = sv_newmortal() ; + if (RETVAL == NULL) + SaveError("%s",dlerror()) ; + else + sv_setiv( ST(0), (IV)RETVAL); + + +void * +dl_find_symbol(libhandle, symbolname) + void * libhandle + char * symbolname + CODE: + DLDEBUG(2,fprintf(stderr,"dl_find_symbol(handle=%x, symbol=%s)\n", + libhandle, symbolname)); + RETVAL = dlsym(libhandle, symbolname); + DLDEBUG(2,fprintf(stderr," symbolref = %x\n", RETVAL)); + ST(0) = sv_newmortal() ; + if (RETVAL == NULL) + SaveError("%s",dlerror()) ; + else + sv_setiv( ST(0), (IV)RETVAL); + + +void +dl_undef_symbols() + PPCODE: + + + +# These functions should not need changing on any platform: + +void +dl_install_xsub(perl_name, symref, filename="$Package") + char * perl_name + void * symref + char * filename + CODE: + DLDEBUG(2,fprintf(stderr,"dl_install_xsub(name=%s, symref=%x)\n", + perl_name, symref)); + ST(0)=sv_2mortal(newRV((SV*)newXS(perl_name, (void(*)())symref, filename))); + + +char * +dl_error() + CODE: + RETVAL = LastError ; + OUTPUT: + RETVAL + +# end. |